Problems starting my new 408

Treblig said

If it stops cranking (or cranks really slugishly) when the cylinders get fuel then it could be timing.

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THIS and it is easy to confirm. Simply ground the coil wire and then crank it. If it spins "great" then it is timing!!!!

I would double --triple--quadruple check that your timing marks are correct. You know how to use a piston stop?