I did the supplemental electric pump on my Hemi car - meaning in addition to the standard mech pump - but that car had 1/2" fuel line.
I'd run the electric for about 30 seconds or so until I could hear it had filled the line.
A few pumps while cranking over and the car would light.
It also ran an MD6, MP distributor, and an F150 coil, which was a great addition. Headers, big cam, 11.70 car.
The car might sit for a couple weeks to over 4 months of winter.
Did a similar deal with one of my 383s - stock line, mech pump, AVS, ignition - and it didn't make much difference on that car.
I used one of those low-PSI plastic pumps, but the darn thing also leaked, so got rid of it.
The Eddy AVS2 on there now starts more quickly; I crank it maybe 30 seconds, then a couple pumps, and it lights.
Sits about the same as the Hemi car did.
My other 383, all stock, is about the same deal.
A stout 512 I had was oddly the quickest of all my Mopars to light off, but was not fat. Holley, 3/8 line, Carter mechanical pump, same ignition as the Hemi.
None of them had/have chokes. Temps typically 40s - 80s when starting.
I've never had several minutes of cranking on anything unless something was wrong.