318 questions...

D with the gears you have now and the automatic it may be a little sluggish off the line but you did say you are going to switch to a 3.55 gear and 4 spd. so with that it sounds like it would work good at higher rpm's.

Just curious what brand cam are you looking at there? The reason I ask is if it isn't a Comp cams you can't really compare specs exactly unless you have ALL the specs. I ran into that with the cam I have in my Cuda. There are overlap, and rate of lift to consider also.

But to be honest I'd still look into the Extreme Rumble mentioned. Since your running on the street with full exhaust the extra duration it provides on the exhaust will help you with your stock heads. I think it would give you a little more torque that your little 318 can use.