So I think I have a really dumb question here. The guy I bought the car from said they dropped the tank and changed the pump and added what looks like a summit LS regulator. I’m going carb and need to kick it down to 6.5 psi. Can I just add the new regulator where the rubber hose is downstream of the one that’s there or should I remove the old regulator altogether?
Thanks

 

Yes, you can add an adjustable regulator under the hood, but I strongly suggest a return style regulator if you do, it'll keep you from getting vapor lock in hot weather. not to mention keep you from burning up pumps.

 

With a FI pump and a carb, you are asking for a lot of trouble. Read the post I did on a solid fuel system for electric pumps on carb motors with a return line. It will cost you some time and money to get it right, but there is no other way to do it reliably.
Fuel supply and pressure regulator set up - Third Generation F-Body Message Boards

 

This can be completed safely and right.

The picture you show is your fuel filter, not a regulator.

Return style is the only way to do it right. My opinion.

The regulator should go as close to the carb as reasonable. This keeps the pressure most consistent.

Use a regulator designed for carburetor pressures and fuel injection in tank pump. I use the Aeromotive A1000 and have nothing but good things to say about it. I trust this regulator to deliver consistent pressures and I run nitrous making this even more important.... but it's $200

That being said I used a cheap holly return style successfully for years and if not running adders you'll be fine. I had a 360sbc running 13.5s quarters on street tires on this setup for 10 years.

Worth noting I've run a FI pump and carb for 15 years now on this car and never killed a pump.... but I am on my second motor :-)