Sounds like you want an awful lot out of what you have there.
I ran a 70 Nove a lot like that ( On a budget too).and you can have a strong SBC with out spending a fortune, but first you need to shop in the right place. I bought many parts form the leading catalogs, and paid a bunch in Shipping & Handling.I finally found a cheaper way to go.
Is your engine in good condition? 8.5 comp. isn't much to start with, choosing a cam is vital, I used a Lunati cam & Kit that was 280/290 duration 214/224 @ .050in. Lift 443/465,12 Lobe separation. I used 1.6 Alum. Roller Rockers , this is good for 1500-5500 RPM. this got me good low end even with 323 gears, headers AirGap manifold & 650 Double pumper. I sell this cam& Kit for $159.95 I think this is the lowest you will find any name brand cam & Kit. If Not buy what you can, but DON'T use a used cam!
Also you should have headers, and a good Aircleaner so you can get all the air you can through your engine.
I could go on for hours , but space isn't there.
:arrow: look on
www.rodsncustoms.com