Feeling pretty stupid I just cashed out >2000 bucks on a 390.
Align bore, decked .005 below deck, .030 over forged pistons, rods re-sized ARP bolts.
Now the punch line, it's a garden variety cast in 69 block, it wasn't until just recently I learned that
390 blocks with reinforced webbing at the main saddles could be found rather easily, I feel dumb because I thought the beefed web blocks were exclusive to 427 blocks, CJ's and never gave it another thought, oh well I'm still confident in it being a good engine for my street driven fairlane, old school solid lifters cam and a 4 speed, nothing serious, 375hp maybe with the headers and R heads exhaust ports opened cj valves PI intake 735cfm cj carb, hot ignition good timing curve.