That is one of the early Mega blocks hence the cast in M emblem in the middle of the block on both sides   Thank you. And know I'm more confused than when I started. Mega good? Mega bad? World good world bad? Haha They can be good or bad. You won't know until you take it all apart and have a pro check it out. Magnaflux, pressure check, sonic check, etc. The harsh bit of reality
1970 4spd Superbird, '69 Charger 500 Daytona clone,2015 Hellcat 6-spd B-5 Blue,1968 572 Hemi Charger,70 GTX 535 6-pac 4 spd,69 GTX 440 4-speed Super Trac Pac Car, 1973 383 Barracuda, and a couple Cummins
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