which efi fuel tank?

I guess each has it's own advantages. An internal pump will normally run quieter and cooler but is a more difficult install. - And if you need to replace a pump someday, it's a lot more work. The hidden internal pump will be less obvious and as such, give the car more of a 'factory' appearance. I don't mind having mods that are apparent. - But sometimes I get a bigger kick out of the modifications that are more subtle. That all having been said, the bottom line is making choices based on the best performance without breaking the bank. We installed the FAST EZ EFI 2.0 system on our '70 Roadrunner and altogether spent around $3200 on parts. The reason we chose that system is that they advertize it to support up to 1200 HP. I doubt we're pulling 450 out of the 383 we're running now but I guess we're prepared for future upgrades now.