Pistons to put in a 450 Block?

I Have a Farmall M that I'm building into a pulling tractor. I already have a block from a Farmall 450 that I have already stripped the pistons, sleeves, and rods out of. From there, I believe it is 4 3/8 inches wide. I was wondering which pistons that is 4 3/8 would work for the 450 block. From, there which rods would I use that would fit the wrist pin of that piston head and the crankshaft of the 450 Farmall block.
 
If you check your sleeve thickness I think they are about 1/32" thick making the block cylinder 4 5/16" A lot of people will bore them to 4 3/8". The real question is how much horsepower do you want? a 4 3/8" bore by 6" stroke is a popular lower cost build giving you 368 CID.
 
Murphy's motor service will get pistons made for you with the correct compression ratio. You will need to know the combustion chamber cc of the head as well as the stroke. I would use your rods if the stroke is under 6 inch. Murphy's also has a head gasket that will work for the 4 3/8 bore. If budget allows get a new lp head,you'll probably have to put a bunch of $ in the old one anyway
 

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