6-bolt block.
#21
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nice find man. yea a forged piston/rod combo will run you between 700 and 1000 depending on the name but any name brand will hold 600+. you'll also need the rod bearings, main bearings, are you getting the main cap with it? if not you'll have to find one of those and have a maching shop line bore it for you. all in all about 1500 bucks later you'll have one sweet block!
#24
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i got clevit for my 420a back in the day which i'm told isa very reputable company. (rod and main) which will run you about 100 bucks for the both of them. while ur at it... personally i'd also get the polyurethane motor mounts if you are going all out. it's only an extra 100 bucks for all of them and they will keep ur motor very very sterdy in the bay w/o all that rocking n swaying.