360 Advice Needed - Autocross / Street Engine Build

I ran your numbers and would put in a .050" thick head gaskets. That will put the static CR at 10.6. You can put in a thicker head gasket to drop SCR and DCR, but that will do away with your quench gap; that effect helps to fight detonation.

DCR with you original cam and a .050" thick head gasket is 8.5. I think you can run it with the AL heads but you're gonna have to stay on top of your tune. And be ready to do some octane treatments if need be. Don't go high on the ignition timing; IMHO, you have all sorts of compression and torque so it won't be needed anyway. And if you smooth the chambers and add just 2 cc's to the volume, your SCR and DCR are gonna drop a bit over 0.2.

The DCR number above is based on the original cam at a 106 ICL. I would not advance it at all.

I think RF360 is concerned with the DCR and is suggesting you go for a longer duration cam as in a 284 duration type. I agree on being cautious on this engine but would try it myself at this combination if I wanted to get as much as I could out of it. Keeping low RPM torque is important for this use, and the higher the cam duration, the less low RPM torque you get. The Lunati may or may not lower the DCR; the .050" durations have less to do with DCR than the advertised duration. (But that also depends on the DCR calculator you use....) The Lunati will give you more breathing for the same advertised duration, but with the heads you have and the RPM band of use, peak HP is less of an issue. (BTW, my racing discipline has been rally, and it is the same deal: a wide torque band trumps peak HP aaaaaall day long.)

As for the torque converter, I seriously would go to a 2200 or 2500 stall TC. Here is the reason: When you pile into a corner and get ready to pick up the throttle to exit the corner, it is gonna take another few tenths of a second for the TC to lock up hard with the higher stall speed. That few tenths of a second is an eternity for road racing and rally, in terms of getting the torque to the rear wheels and setting the car, transferring weight, etc. You have an engine that is gonna have gobs of torque waaay down towards 2000 RPM, plus a 3.91 gear; it is gonna break the tires loose at will with even a 2000 RPM stall TC!

Hopes this helps... sounds exciting!