Well if yur going aluminum heads, then you IMO, need to crank up the compression ratio. In which case KB107s or similar pistons will drop in with about .012 deck height. That together with an .028 gasket will get you .040quench pretty near perfect.
That will get you a total chamber size of about 74.2cc, and therefore a compression ratio ( At .030 overbore) of about 11.1 perfect for aluminum heads.
This combo will like an Intake closing angle around 64*, and will pull like a freightrain. You could install up to 68*and not lose too much low-speed torque, while gaining significant top-end power.
A streeter does not need a ton of top-end power, because it usually has to be band-aided with gears and a hi-stall to get out of it's own way below 20 mph. Without performance gears the power doesn't usually arrive until about 40 mph at no tireslip.
A streeter doesn't need gobs of off-idle torque either, it just lights up the tires. and spinning ain't winning....... but it can sure be fun, if yur car is set up for it.
IMO, a streeter needs midrange torque at a comfortable speed, to go hammer down in first gear. For me that is about 30 mph. If I have to shift almost right away after that; it sucks. If it is able to hold that gear to 50mph, that also sucks. If the cam falls off too soon or doesn't come in soon enough, that also sucks.
Yur gonna want at least a 750 to go with that 64*Ica. And I highly recommend a mechanical secondary carb that opens all 4 barrels to atmosphere without respect to rpm or airflow; this puts you in charge of tirespin, cuz yur gonna have a lotta "trouble" with tirespin.
When you go cam-shopping, I highly recommend to get one with the fastest clearance ramps you can find. The difference between the fastest and the slower ones can be the equivalent of 1 or more camsizes at .050. Depending on the combo, the difference can be more than n20 horsepower. This too sucks when you find out about it .
If you are a streeter,and you buy a cam for the sound, well,in the end, that usually sucks too.
The difference in fuel usage at hiway speeds between 64* and 68*Icas on 110LSA cams, also sucks.
So if you go for the 68* Ica, And I higly recommend that you don't, make it on a 108LSA; you'll pick up around 6 or more degrees of power extraction, to help plump up fuel-economy on the hiway. Just make sure your hiway rpm is high enough that yur cruise vacuum has plateaued, or, about 2400, which requires about a minimum rear gear of 3.23s. No problem. No problem because to get that 68* cam, is gonna take about a 284* advertised cam. And that 284 is gonna torque-peak at around 3500, and for oh-chit! performance, that is gonna want 4.10s to hit 27mph at that 3500 ... so it will cruise at 65@3300@zero-slip, and no problem.. No you don't have to run 4.10s,lol. You can run the 3.23s and wait, and wait, and wait, for the power peak to hit at about 5000rpm/48mph, and shift at about 5300@50mph........ and watch the guy in the fast lane, motor on by you,lol.
The point is, that IMO that 68*Ica is way too big for a streeter. Even the 64* cam is pushing the limit. I've run both in about the same combo as you are now building, and of the two, the smaller 64*was the better choice.
60/62* on a 108, IMO would be even better, allowing a civilized 3.23 with an automatic and about a 2400TC about like a stock 340 convertor. Tighten yur seatbelt brother.
