With current tune I have 17 very steady inches of vac. @ 900 rpm idle
Forget that...thats just how it sounds and idles...change that around to do what you want it to...
It is what happens when under load and at cruise doing 140 mph across the Nulabour.
ONLY CHANGE 1 THING AT A TIME
1st get the timing in the ball park put a couple springs in so the advance comes off around the 1100/1200 mark
What is the intail without and with VA connected?
timing is 31 total all in by 3200 rpm
if you have a nice stable idle now, dont mess with the intial BUT u do need more total cent advance (no VA connected) in the ball park of 36 degs @ around 3200.
Hopefully you can increase the range of the cent and not just have to rely on upping the intial.
And a VA that works around the 12 to 17"
And with 6 to 10 degs in it.
If you just want to have a quick play....
VA disconected Take the rpms up till the cent is all the way in (3200) the set the timing to 36 deg...re connect the VA and take it for a blat.