The Summit cam will be ok and is cheap. If I were to pick a cam I would choose the XE 256 Compcam. It is superior to Summit grind and will out perform it as well. It will put you into the 14's easy. You can run the factory valve springs if there in good shape.
212/218 dur .447/.455 lift on a 110 LSA which is better for a low compression motor vs 112LSA. Strong torque low and midrange. I do not think another cam out there will out perform it in the parameter that you describe.
Keep the headers , just replace the gaskets with a copperseal type.
Dump the Holley when you can afford and buy a Qjet.
Good luck
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