Might want to recheck your fuel pump rebuild. Does to diaphram rod engage to rocker arm?. I'm just getting my fuel problem fixed. Fuel line was sucking air and rust from the pump to tank line. 2 five foot brake line from Napa Auto parts and some tube bending to match to old lines and the air and rust is gone. Previous owner had the tank redone, but not the line. Almost thought it was the supply tube inside the tank. Sometimes you just have to prime the gasoline to get enough s
peed for the pump to feed.

Here's some thoughts
That fuel pump has a nifty hand prime lever on the bottom that allows you to manually pump gas to the carbs!! You might want to disconnect the fuel line upstream of the pump and try pumping by hand to make sure you've got fuel as far as the pump.

Also, in the case of a potentially clogged fuel line, it's generally a better idea to blow from the front of the fuel line back into the tank. Blowing crud forward from a large container into a smaller line and then the pump, float bowls and jets is bad. Especially in the absence of filters. Got any?

Have you been into the float bowls at all? Those can nasty up fierce especially if water/moisture spent enough time in there. I've seen those brass floats frozen up with rust and oxidation. Getting it only to run on starting fluid is a good indication that it's fuel starved - I'd start at the float bowls and work back from there.

If there's crud in your tank, although you may get it running, you may soon find, somewhere down the road, that it dies for no reason, and so you might remove your tank and clean it out.

It's possible to put the pump on with the lever on the wrong side of the cam. Yes I've done it once but if you hold the pump with the flange parallel to the block as you fit it, you should be OK. Is this your problem? I don't know but worth checking. The early B16 glass top carbs had a manual lever underneath. This will work the pump but if the lever is the wrong side of the cam it won't work the pump.

Are you sure it's a spark issue and not that it's getting no fuel through the carbs? Is the fuel pump working? Is gas getting to the carbs? Just checking. Sometimes I assume it's one thing and then it turns out to be something totally different.

Please check it and post back