Why don't you buy a set of #64 heads with a cc of 87, probably been cleaned up to 80-85 over the years. That way, you have a streetable motor, 91-93 octane and you are all set. Only a handful of people will be able to tell the difference in head codes. As well, you will not lose any value with these heads..they are great. With your pistons, and those heads at 80-82 cc, you are roughly at 9 to 1.
