[Elkie355]

You didn't mention your heads or exhaust headers? Stock heads will limit your flow potential and you'll see a big improvement with your current setup if the heads are massaged.

 

[drptop70ss]

sounds like a good combination that should pull well even with stock heads in good condition. couple of things I can think of is first compression ratio, you need 9.1 or better with this cam, if your static compression is too low then cylinder pressure is going to be too low with this cam. Next would be timing, make sure initial timing is good and both mechanical and vacuum advances are working correctly. Retarded timing will make the engine a slug. I wouldnt go with the 305 cam, I have this in a 427 and it is a wild one, not what I would consider a street cam, more like a weekend only toy that blows gas out the tailpipes! And this cam needs 11:1 compression and better heads/induction to work correctly. Put it in your engine without the right supporting equipment and you will get beat by mopeds!

------------------
70 chevelle ss396 conv
66 chevelle ss396 hdp/conv
55 chevy prostreet