Actaually, the Mod-50 sleeve CAN be installed in the fishing block by boring, welding in port bridge supports, then re-boring before sleeve installation. This is an expensive mod, so I've never actually done it....... The biggest reason is to get more support for the piston skirts on the intake side - the Mod-50 uses ducted boost and transfers instead of the open channels in fishing blocks.
BTW: Just out of the shop where I built four Mod-50 ported 49.9 FE/850's, two 56.6 SLT's and a Merc 444. Three more 49.9's to go.......
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