18436572
If it is backfiring the timing is set incorrectly or the spark plug wires are not connected in the correct order.
A 1968 Plymouth satellite 273 is a classic automobile. Its firing order is 1 5 3 6 2 4.
Fig. 4: 1970-74 Oldsmobile-built 350, 455 V8. Engine firing order: 1-8-4-3-6-5-7-2. Distributor rotation: Counter-clockwise
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I believe 18436572
V8 is 1-8-4-3-6-5-7-2 Inline 6 is 1-5-3-6-2-4
the firing order is the same as Chevy 350 except opposite rotation instead of clockwise it is counter clockwise
1 - 4 - 3 - 2
if its a six cylinder it will be 153624
1-4-3-2. All aircooled 4-cyl VW engines used the same firing order
1 3 4 2