Could you not run a brake vacuum pump ? Like subaru's run ? Also Aus holden commodores run them , sure be the same on chevys . They will pull up to 20" vacuum . Use an adjustable pressure switch to set .
Plus the holden type , hella makes them i think , is quite small

Tex

Last edited by tex013; 02/29/20 01:07 AM.

New best ET 10.259@129.65 .
New best MPH 130.32
Finally fitted a solid cam,
stepped it up a bit more
3690lbs through the mufflers
New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm
Power by Tex's Automotive