Just a Question for you. why not stay with the 250 and rods and Use the 307 pistons.What your going to end up building is a 230. why keep the cubic in.
example 307 flat tops 194 head neting???(10-1 compression) ball park not know what you may or may not mill off the head.Also depending on the cam. Rpm range can be anytihng from 6000 to 7000 rpm plus?? And Like any Motor How long it may last Depends on HOW OR WHO built. I ran the same 250 for 17yrs and never had it apart and it was a daily drive turned 100% drag car after a few yrs as a daily driver NO changes to the motor Other then intake system. AND Better gears out back. And the motor was stil runing Strong when I desided to rebuild it. many & bigger Up grade only reason for rebuild.
Ps And I ran 7000 plus rpms. Never left the line Less then 5000rpms.
I knwo i may not have really answered you,But i hope this helps }[oooooo]
God doesn't like ugly.
