I need some help figuring out the details. I want to build a sbf that puts out around 500hp. It's for my 64 comet which will be a street/strip car. I was looking at Probe internals. But is 427 with a 4.170stroke too big of a stroke or would a 408 with 4.000 be better. Also which heads should i use. I was looking at stage 2 AFR heads but they're pretty expensive. I was wondering if there were any cheaper internals for that big of a stroke. I wanted to run dual quads for that 60's style. Please help me out with the details.