I am looking for some information regarding the differences in engines between the M113 4.3L and the 5.5L.

So far, I know that the pistons and connecting rods are different. How about the camshafts? What other differences are there? I will have to carry over my headers (or buy/fabricate a better one) as well as the oil pan, alternator, etc etc......

Asking because I am looking to build one. Need information so that I can make proper decisions going forward.

Thanks!

edit: I am looking for hard facts, either in print or from people very familiar with the engine (cough cough Remo). Please dont post "I think or I heard that....."