[MrPbody]

No need to "make" a 4-bolt block. Even the later "1-piece seal" blocks are plentiful in trucks. You will be money and strength "ahead" to use a factory 4-bolt. Of course, if you're interested in installing "splayed caps" (bolts are at a slight angle), that's different.

If the engine has been run for any length of time, you really need to bore it,m at least .020", to have a "fresh" cylinder. The supercharger will change everything, and start out "right" to have a fighting chance.

We've used many Eagle rotating "kits", including one LT-1 with a ProCharger recently. Highly recommended.

If you really intend to put a blown engine on the street, use only the best materials inside. Listen to professonials first, everyone else, second (unless one has significant experience in this specific area). Superchargers and street driving are NOT for the "faint of heart". Magazines tend to embelish a bit and make you assume it's both easier and more common than it really is.

Jim