I saw those last night for around $6k along with a convo with Noobz different about options. Got me to thinkin'...
If I wanted to build a 302-310 out of a bare block I picked up cheaply but that requires machining and all parts from the balancer to the flywheel, then I'd be into it for about $5k -- I've priced what I want in a Mexican block, for example. If I'm going to build a $5k shortblock, I might as well go Dart SHP for $6k, like from the shop you mentioned. If I go Dart SHP, then for the same price, I might as well build a 363. But, and here's the problem: if I put the 302 heads on a 363, well, that's foolish. So, conclusion: either spend even more money reworking the combo I already have the top end for, or stop the snowball and use 'em on the stock block as originally intended.
So, I'm going to put my 302 top end on a 302 without spending a ton more money. I do NOT want Black Jack to be another hugely expensive project. I already have 2 of those. So, I'm just gonna slap 'em on Black Jack, as is... maybe with new bearings. If I start to hear things sounding or acting funny when the motor wears, then I can refresh what I have or just pick up an assembled shortblock for $1-2k. This slippery slope would've snowballed me into many, many thousands of dollars more, and it's not the original vision for keeping Black Jack affordable.