Hi Wilf, long time no speak!
If I did it again it would have a Dissy at the front.
The only reason it hasn't is that my chassis was already set up for a Chevy when I bought it as an unfinished project.
The HEI in mine is the high voltage jobbie so it should be OK.
I removed the Vac can and locked the vac advance wheel at the weekend still runs like sh1te.
I think this confirms that my problem is in the electronic side.
I hope my new HEI will arrive very soon if not I'll going MSD as recomended.
What do folks think is the best one to go for and with what coil etc.