I had a friend that used diesel to clean sludged up motors. Maybe fill it up with diesel or some other solvent, let it sit for a couple days and repeat until it starts to come out clean. Then fill it up again, pull the distributor and use a priming tool to flush it through the system. Then with the dist out you could prime it with fresh oil before trying to crank it.
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Ray Klemm calibrated Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear
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