Sanden compressor for Vintage Air Sure Fit gen IV

[showdog75]

I recently got a Vintage Air Sure Fit gen IV for my 63 Chevy II wagon. I'm in the midst of a ls2/t56 swap and looking to install the VA at the same time. This system is brand new never used but it didn't come with a compressor. I already have a sd7 but after talking to VA they recommend a sd709. They said the sd7 will work but won't be optimum. I'd like to hear from those that have used one or the other or both. If i understand the sd7 is over driven on the VA Frontrunner setup but I'm running gto/f-body accessories and want to run a low mount like the Alan Grove bracket. Is the sd709 that much superior to the sd7?