There is probably no way to do this on the cheap, it isn't like there are small block Mopars with 4 barrel setups sitting in the u pull yard, not in my area anyway. .
Getting harder at the bone yard, I agree. But still can be done on the cheap. a person just has to get busy, and be a little patient.
intakes for example- Cast intakes can still be found for under 50. CL, local swap meets, maxi vans or ramchargers sitting in the back weeds. Even being lazy I bought a real nice '73 340 cast intake right here on FABO for 60 shipped. I also bought a real nice Holley Street dominator intake at a local swap meet last year for 30 bucks. That's right, 30 whopping bucks.
If he took the time to read my 1st post of my 318 build, I did new cam/lifters, 4bbl and intake, new timing chain, new gaskets and expansion plugs, freshened up the heads with new springs and exhaust valves, lapped the intakes and home ported, all for 497.00 bucks.