351W

BlackVert said:

older mexican blocks are stronger, but they are hard to come by nowadays.

when i was researching it, people told me that they didn't start using roller 351s until 1994-1996. but you have options with non-roller blocks:

http://forums.stangnet.com/showthread.php?t=652423

(1) - get it machined for a roller cam, about $200 more
(2) - use retro roller lifters, i dunno the cost of these
(3) - use a flat tappet cam/lifters

personally, i'd do option (1) ... that is the direction i'll go when i build my 393

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