340 has no timing tab...

Whoever had it before me had it retarded a little too much so I timed it by ear for now. I will probably find top dead center in market and use a pointer on the driver's side.And either use timing tape or make marks or use a dial back

You my be able to do it with pulling a valve cover and putting the dial indicator on the #1 intake rocker find TDC that way or the best way is finding tdc with a piston stop and degree w heel IMO.