[ZOERA-SC7XX]

If I'm not mistaken, the 390 block with a 428 crankshaft will give you a 410, which was installed in several Mercury full size cars. I made a 428 by boring my 390 block to 4.130 (.080) with a 428 crankshaft and KB pistons, which should be okay as long as you retain proper wall thickness. SCAT makes custom stroker crankshaft kits for 390's getting up to 431 cu in w/.030 overbore. Make sure you use a 428 flywheel (external balance) with the 428 crank.