Here's my situation. I've added Holley Sniper EFI and it's been good so far. If I had to do it again, I'd opt for the inline exterior fuel pump. My friend has this and it's a loud pump for sure, but it has its advantages. I installed a new gas tank ( 79 T/A sbc 400 mota ) designed for the in tank fuel pump and I've had my issues with it. I over tightened the fittings and cracked a $300 plus fuel pump= leak ( my fault) dropped gas tank. Next time I was gun shy and didnt tighten enough= leak another gas tank drop. Fuel line routing problems and pinched fuel lines- tank drop and hammer the trunk floor up in a few areas for added clearance. These gas tanks dont leave any wiggle room. Fast forward 1.5 years and everything has been good. I fire the car up this week after storage and gas leaking on the floor when car is running. WTH! Yet another gas tank fuel pump issue. When I have the tank out this time, I'm thinking about cutting an access panel in the trunk floor. Has anyone done this? If so , post some pictures. thanks. Going out to siphon gas yet one more time.