[Aussie Mike]

I've used 600 Vac sec holleys on a couple of cars in the past. They have generally been good and easy enough to set up once you understand holley tuning. You can buy everything for them to dial them in and there are plenty of good holley tuning books out there. I used to rely on a vacume guage and checking plug color to help me with the setup. These days it would be so much easier with a wideband O2 sensors available.

Cheers