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Firing order for 351s is 1-3-7-2-6-5-4-8. But, if an early 302/289 cam is used, it's 1-5-4-2-6-3-7-8, otherwise revert back to the 351 firing order. If you're not sure check valve action. Turn the crank so #1 is on TDC of the firing stroke while watch the valves, then turn it 90 degrees more and watch the valves for #3 and #5 valves. Pick the one that moves the same as the #1 intake valve as it was moving when the crank was coming up on TDC for #1.
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Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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