Your carbs are probably gunked up. Do you have an ultrasonic cleaner? Simple Green and water heated and run through a few cycles of ultrasonic will make them brand new inside and out. Get rebuild kits.
The carbs most probably don't need to be replaced.
Remove the tank, flush it and the hard line through the chassis. Replace filter and ALL rubber lines with new ethanol-resistant hoses. You'll be good. I like electric pumps too, as long as they are rotary(not Facet!). Get a self-regulated pump, but those carbs look like Solex, which REQUIRES only 1.5 psi. An auxilliary adjustable regulator is a must with Solex/Kadron carbs.
Those tins that are missing can be made up pretty easily from aluminum or steel sheet. There are even patterns available from guys on here for a VERY small fee.
Good luck, looking forward to watching your rebuild.
What's your name @GreasySideUp ?