I have a 1967 Chevy Impala with a 327 that my uncle bought new and kept it in a garage all of its life (20k miles on it). My uncle recently passed away and left the car to me so I decided to clean it up and get it running again, as it hadn't been started in roughly 5 years. The factory carb was a clogged useless mess so I replaced it with a Holly 4 barrel (I forget what Holly it is specifically) and an adapter plate. It ran great for a while until I figured out the heater core was basically destroyed and leaking everywhere. I had to leave it alone for a while (roughly 6 months) due to financial issues but I finally replaced the core and now it doesn't start. I did some investigating and figured out it doesn't pull gas. I've tried plugging a new fuel line into the pump and running it into a gas can, and replacing the fuel pump. It does crank but won't start. Any help would be greatly appreciated.