[Bad Karma]

Hello guys!
I have a pontiac lemans with a 350 plus cube Chevy small block. Its Got Shaved heads seems to be small cam. {mystery meat in car when i got it}. Edelbrock intake headers HEI Dual 2.5 inch Mandrel bent flowmaster exhaust. A 411 Rear
with detroit locker. 28 inch tires. Now I also have A Crane cams Hi-6 Ignition Hooked up to the new Summit HEI distributor. Topped off with a Qjet. TH 350+ shift kit with 1200 stall

Now to the question: what Does anyone suggest My Timing should be set at. The HEI is vaccuum advance But its not an Adjustable vac advance just stock. I was wondering Intial timing and Total Timing and when By. As soon as I change Distrubors Power went down. I Didnt reliaze then I still needed to swap the Springs to Keep the Timing curve the same. Big mistake I know!!
Sad thing is I can No longer Actually Work on my cars Due to a Bad back with 3 herniated disc.
Any help or ideas on how I can get my power back would really help. With 373 and the the Good curve the Car Kicked but Once i get it straightened out With 411 I should roast tires all day!!!!!