Pat, as Elemental says, you can't use a Bosch crank in anything but a Bosch block. Those engines are 4 crossbolted main bearing engines and journal sizes are not close.
If you really want to get fancy, look around the speed shops for the buick 300ci aluminum block engine. It will bolt right in. The best thing about that engine is that there are six headbolts surrounding each cylinder, so you can really dial up some rediculous compression ratios. (can you say 4 Webber 45DCDE ? I think I'm getting a hardon) I've got a 6 bolt buick 215 & heads stashed for when I have nothing else to do.
I have a scored 4.2 crank available to me, but I can probably get another 4.2 engine for less money than it would cost to grind it.
RPI and ACR build the old block engines out to 5.6 litre, and there were a bunch of TVR 4.3 engines around awhile ago (new, longblocks) they were being sold as 4.2s but the numbers say they were the 4.3 (same stroke as the 4.2, slightly bigger bore.) There were also 4.5 TVR engines.
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