440 build for a tow rig/"muscle" truck?

Good thing I looked up the KB catalog, those step-head pistons are designed for open-chamber heads, quench pad protrudes above the deck (by quite a bit) at TDC. So looks like I'm stuck going with traditional flat-tops.

With KBs I'd be around 10.5:1 but Speed Pro L-2355F would be closer to 10.0:1 although that largely depends on how far above spec the block decks are. I guess now that I have an idea what my options are next step is to get a core engine. No shortage of those around here, there is one particularly nice-looking 440 with 67k miles only about 30-40 minutes from me but it's in an RV and the seller expects the buyer to either pull the engine themselves or take the whole vehicle... from the pics it looks to be B-van based and a PITA to get out, not sure if it's worth the trouble for $2k. Then there's a disassembled but seemingly "virgin" 440 out of a 1973 New Yorker for $750 but the block looks like it's been sitting for many years and will need a trip to the machine shop. Also see a "rebuilt" 1976 truck engine for $900, it's on a stand so probably can't see it run but I do have a bore-scope I could bring and take a peek inside. Lastly there's a 'Mopar hoarder' with a ton of stuff for sale including transmissions and two 1969 440 blocks, one "with motor home stuff"(??) for $1k and another "fully machined" for $2500. I sent messages to all the sellers for more info, probably go to pick one up the weekend of Oct. 9-10 after I get my next paycheck lol. And they're all within about an hour driving distance so I'll probably go check some out before deciding in the meantime.