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2056 short block just needs 96mm bore pistons and cylinders, easy. Mine case required a very minor amount of clearancing for the piston skirts.
2270 requires a stroker crank plus a bore increase, which means different rods (longer T4 rods don't seem to be realistically available) which means different pistons with usually T1 or chevy wrist pin diameters and journal sizes and may need some case or rod bolt clearancing. The longer stroke also means longer pushrods and resetting the rocker arm geometry, which can be really time consuming, plus a good look at bigger induction.
I blabbed on about all the variables in a thread awhile back, as I was considering the same options that you appear to be.
Good luck.
Dave
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-- Dave
'73 914, 2056 GT/SC done!
'69 Lotus Europa S2 - under resto.
pics at
http://www.syer.net
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