WIW-'69 ZL-1 engine, assembled

[tom406]

I'm working on an estate project and among a big, loose collection of early Ford cars there is, on a stand, a complete '69 ZL1 that was assembled and dyno'd in 2009. Block was cast 5 23 69 and heads are 842's with the heat passages welded shut. Crank is a stock 6223 forged unit with Eagle rods and new pistons (10.57:1) Dyno sheets showed peak of 500.3 hp@ 5900RPM. I didn't recognize the shop (should've written it down), but the data and record keeping looked pretty good. Aftermarket intake, no carb or distributor, valve train is all Jeg's/aftermarket. Block has a big weld up the side and pad is smooth with no identifying stamps present. Been sitting for 5+ years but I think it should be a runner after due diligence. I'd appreciate any and all honest opinions of what this lovely widow should expect to get for such an engine on the open market. Thanks in advance for your comments. I will try and check PM's often as I'm sure some of you would prefer to have your opinions kept private. -TOM