If you are running HEI you should be fine. Only spend the money if you don't have anything else to do. 
BTW, that engine bay does look nice. Show us a picture once you clean it up. You might also want to take the air plenum apart and remove the AC parts from the car since you don't have the compressor on it anymore. I did that with my 64 and it looks a million times better. You can always save the hoses, condesor, accumulator, etc. if you want to put AC back on the car in the future.
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"Some men are Baptists, others Catholics. My father was an OLDSMOBILE man." Ralphie Billingsley A Christmas Story 1983
"We rei-eign, supreme, ooooh god! Burrito supreme, and a chicken supreme, and a CUTLASS SUPREME!" Tenacious D 2007
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