Project Big Block 74

First of all this site is awesome what an incredible resource of knowledge and information thanks to all members!!
Anyways 74 Swinger 318 904 8.25 bbp front discs
I have secured a 4bbl eddy 600cfm and performer intake I have dual exhaust but need to install headers which I also have waiting.
Not a bad start but what I really seem to need would be some 302 castings
Trying to keep it cheap as I have a 5.9 in the old truck as well which at some point will likely be in the car
Thanks in advance for any info or advice as I said this is my first project and I have very limited knowledge

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