I removed the second cylinder head last week, to change all pistons rings..

I've also a problem with the distributor I think, the piston 8 doesn't run..




I purchased last week an ready to run MSD distributor but I don't know what type of spark plug I have to choose, and what's the gap ?

Do you think those are good ?

http://www.summitracing.com/parts/acf-4


thanks