Outside of the cam, for all intents and purposes you have a stock 440. The performer is basically identical to the stock iron intake. The 3310 offers little if anything over the 440 avs which was approximatley the same cfm. Compression is realistically about what the HP 440's were running, though they claimed 10-1. The log manifolds will hurt. The cam is a bit more than I would pick with this combo unless you are planning on some head porting and headers later. I would pick a Comp cams, either a 268 or 270 series with that heavy of a car. Is there any way you could run the HP exhaust manifolds? I assume you are running a c body? My guess would be, on a dyno, 350-375 horses.