No start after swapping intakes???

[Chevy3+3]

Truck I am working on is my '88 V30 454 TBI truck. I was pretty sure my intake gaskets were leaking so I decided to replace them and switch out the intake for an Edelbrock 454 TBI performer intake manifold. I had the intake removed for almost 2 weeks. After everything was reassembled I proceeded to start it but it was a NO GO.

I double checked my dizzy timing and spark plug wires. They are all correct. When my #1 cylinder is TDC my bug is pointing at #1 plug wire terminal on dizzy cap. My fuel pump pressures up and when I am cranking it is pulsing fuel. I thought maybe I had it flooded. Occasionally the truck will try and start but only sputters at low RPMs for a few seconds and then dies.

I don't know what to check next. I feel like the motor is just on the verge of starting but doesn't. The only components I changed was the intake manifold gaskets and the intake manifold. I have all the vacuum lines/ports and electrical plugs hooked up also.

Any ideas? I am starting to think maybe I'm not getting good fire but would not understand why since my truck was starting and running good before tearing it apart.