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I'm working with a 454 block dated around 1974, so I think that is MKIV? I have square port closed chambered iron GM heads. 11:1 TRW pistons...... I went into a local speed shop the other day to buy some Felpro head gaskets, intake gaskets, exhaust gaskets, and head bolts. I was going to go with GM bolts and regular gaskets. I have zero idea what the correct part numbers are, and am pretty new to BBC stuff. He was trying to sell me ARP bolts because they are "only $10 more than GM", and some "race" head gaskets from Felpro that have a special metal ring? Is this NECESSARY, or is he just upselling a little more expensive parts? This deal will probably only see 5800 rpms in short bursts, and it'll spend most of its life at 2800 or so cruising the lake in a jet boat. If it truly NEEDS something more than stock, then I'll buy it, but I don't want to just blow money on stuff it doesn't need.