Farmall A replacement engine?

I need to replace a engine in a Farmall A, I was wondering what type of block/engine will fit. my old blocke is cracked and cannot be repaird, but we beleive that the internails are still fine. What kind of block owr whole engine will fit? We think a block/whole engine from an A,B,C will work. Will the supers work?

Thanks

The changes I can think of at the moment (working off the (6342) A/B baseline) are:

-all the crankshafts (in this range) should interchange;
-any block after the A/B will have the front bolster bolt by the hydraulic pump threaded in the block expecting the bolt to come through from the bolster side (opposite of A/B);
-early Super A/C (251069) sleeves should interchange with yours;
-late Super A/Super C/100/200 (354898) sleeves will not interchange;
-130/230 (366204) sleeves should interchange with yours. (I should say aftermarket sleeve&piston sets here; there has been concern posted on whether the factory ones are interchangeable and I haven't taken the time to get to the bottom of that yet.)

The casting numbers (in parhentheses, and located behind the oil filters) should be used rather than the tractor the engine is on at the moment, and as Hugh mentioned, be aware some of the blocks have been modified internally. Ref this thread for some more info:
Link

Stan(VA).

However you should be aware the block part number did change a few times even in that group, may not make any difference but as old said there are different part numbers, so something must be different. Even if you find a block with same part number as yours, you still have to check out the fact someone may have done a rebore, to acomodate oversize sleeves.

Safest bet is take the old block when shopping, make sure it is exactly the same.

Keith & Shawn