yes overkill, this is a low RPM truck torque build. I would suggest some eBay cast cheapies/moly rings or kb hypers (which are way better but more $$) and you need more compression which the KB's would give you & you likely could get quench if you go with some aftermarket closed chamber heads & carefull measureing & as said heads are gonna be the big expense on this as rebuilding a set of iron stockers can approach a set of aluminum aftermarket ones (stealths) tho you might be able to get by with a valve job (odds ain't good) & are they flat tho with composition head gaskets you can have a bit of warp & they lower your already low SCR as opposed to the OE steel shim thin head gaskets. I would get some plasma moly rings (& cast pistons off of eBay) & after the shop bores/hones, you do a quick hone with a Brush Research Manufacturing dingle berry hone for moly rings and your bore size or have them do it (its worth it).