If can afford a roots blower you can afford the proper forged pistons and dish em as need or valve angle change for later normal heads... plus if ya can afford a blower you can just built a 400 or 455 block and move on....
for just driving no blower.... stock low loft 066 cam I put 71 400 2v small valve #99 heads on our 66 Starchief 389 10.25:1 motor that had 092 heads.. 56k mile original short block runs great now at about 8.0:1 on 87 octane all day no issues hot weather no issues.
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