My first piece of advice is get the car that you have always wanted and desired that will fit into your budget,,if it's a early B-body then thats what you go after, then build a motor with a solid bottom end that you can build on at a later date like adding different heads, intake and cam as you can afford it,,I started out with my car with a rebuilt 318 and then to a hotter 360 with better bottom end parts and tinkered with porting the old iron heads that came with the 360 now I have stepped up a little with a 408 stroker 360 and run consistently run in the low,low 10's,, this project started out 20 years ago and each winter I set a budget that I am willing to spend and then decide what the car needs the worse that I can fit reasonably within that budget.