hey guys....454 question here (newbie)

[confucius_Sez]

well, i've bought my uncles '76 LWB rust bucket with a 454 in it. it has no overhauls from what he told me, just timing chain and another minor replacement.

my question is, what options were offered in these year motors? by that i mean, are they strictly 2-bolt mains, or could i have a 4-bolt under there. also, im not certain if i heard that the '76 454 is the only motor where i can bore it ?.120? is that right??

im debating if i should keep this bad boy or sell it. if i were to keep it, how much would it cost to keep it at a mild 400 HP or around that? i have another addiction for speed, just want something with some umph. know what i mean?
but if i were to sell it, what would be a good, fair asking price if there's no cracks in the motor or nothing bad, cuz isn't this a good crank (if so, im not sure which is better, steel or cast?)

anyways, im surprised i haven't signed on this board lots earlier. i have an '86 silverado SWB that misses me babying it. (that's what happens when you have kids i guess) well, i hope i can be somewhat beneficial and helpful......if not, i'll just sit back and learn to what ya'll have to say............
and HI FROM HOUSTON!!! WELL, BAYTOWN ACTUALLY!!