If you need 350 hp there's easier, possibly, cheaper ways to get it.
But if you just want a snappy teener, for a streeter, I'd have to say; adjust your expectations. 275 crank horsepower in a lightweight A-body can be a ton-O-fun! This is just a lil cam, a small 4bbl, and a free-flowing exhaust, with headers.A little head work, and it can be a lil more funner. For a street-teener, IMO a guy needs to concentrate on torque, and let the power fall where it may.And here's why. Most street fooling around is done in 2nd gear, and 30/35 mph. well then your engine is doing (with 3.55s) about 2100/2200. If you don't have torque there, don't even bother. But let's say you have a shift-kit in your 904, and it kicks down in a heartbeat. Then in 1st it will be spinning at 3600ish. Now you are getting somewhere. A 340 type cam, or a little smaller, will make good torque at this rpm, but a cam big enough to make 350hp in your teener, is still nearly 1000 rpm from it's torque peak, and probably not yet making as a much as a cam of 2, or possibly 3, sizes smaller.So instead of shopping for 350 hp (which in a teener will take quite a bit of rpm, and therfore a comparatively long duration cam), you should be considering to build an engine to maximize torque just where you need/want it.
If you select a rear gear first, and figure the tranny powerband out, and decide just when/where you want the torque to be, this makes picking the cam much easier.A little head work to maximize the upper Rs, and possibly extend the Powerband a bit, and maybe a lil TC to get you out of the hole, and it's done. Now don't go wanting to make any big changes. Just drive it and enjoy it!
Don't forget; if you match your powerband to your tranny,and optimize the combo, you will get the most out of it that she is able to give.A big cammed engine will want a looser TC and bigger gears. Mo-money.
The only thing worse than a big-cammed, lil-engine, stuck in your A,with a lo-stall TC, and hi-way gears, would be to drop it into a big heavy car.
Ok, end of rambling.....
