360 budget build

Put the SM intake on it. Decent intake and will help.

The rest of the stuff should be able to make 300+ hp with a good tune up.

Unless there is something wrong with the stock main cap bolts, why replace them.

Hughes springs and budget? Nope... trick flow 16901-16 $53 for a set at summit. Same spring that comp recommends, IIRC. That will save you about $50 right there

Buy the 4 seconds flat limiter plate and do the timing/curve yourself using the OEM electronic distributor. Run an older orange or chrome box... BUDGET!!!