dual spring
Also, Bauer Racing does (or did as I haven't kept up) a lot with Dart heads and so does AI if you want to do more than a spring swap. They have some good programs for more performance from the heads.
I am building a forged bottom for my FI and am thinking of upgrading my cam to one better suited to FI, and was told buy a vendor that I need to go dual with FI. I wont go very large (or high) because it is first and foremost a street car, spending 90% of it's time cruising
The heads have been ported, and with less than 10,000 miles on them, I would rather leave them alone

