Just want to be sure that I have the proper mounting for the engine stand. Using the top two 3/8" threaded with grade 8 bolts and the two lower 7/16" non thread with grade 8 bolts and nuts. My concern is the lower driver side mount ( starter) strong enough as the block has the cast cut out for the starter. Don't want to bust the block. The only other option is to use the other 3/8" threaded. Looks much more stable using the lower. Sent pix. Any advise?