I have a 75 Cadillac Coupe Deville with a 500, the carb is shot so I picked up a used Holley Pro-Jection 4. This is the first generation Pro-Jection 4 with the smooth computer not the one with the heat sink. It's non-digital. The original fuel pump did not come with it, I think it calls for 15 psi. I've heard there's a factory GM inline pump that would work to replace it? If not, what pump can you guys recommend. Also, I'd like to convert it to use an oxygen sensor, is the kit still available? Do you guys have any tips for installing it? Things I should look out for? Thanks Guys.