It’s really not worth dumping all that money into getting work done to a factory 455 crank to fit 3” mains.
Just get a new 4.210” stroke crank with the needed 3” mains.
You can get pistons to work compression wise with either of those casting number heads.
The 6X heads have a better intake port then the 16 heads and even though they only have a 1.66” exh valve it’s been shown ( at least in a 455 ) make more power up to 5400 rpm , which is fine for general street and street strip usage.
Either way you do go head wise be sure to get new valves.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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