Has good spark. Brand new distributor. Checked valve timing-perfect. Checked cam and crank keyways-intact. new plugs and wires. Swapped entire wiring harness from known good spare unit. Swapped LPG regulator from known good spare unit. compression is 175 at all 4 and holds. Problem-cranks and back fires out intake. Will not start. Checked timing multiple times and still no success. Any ideas???
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