I can't change anything on the actual motor firewall and mount holes. At least not without a ton of work. I made the firewall very heavy duty using a one inch thick piece of hardwood plus extra plywood, big blind nuts all epoxy in on the back side of the thick firewall. All super heavy i know, but I knew I would need extra nose wieght, and turns out I still need to add about a LB of lead. The heavy firewall will also help to absorb some engine vibration from the G62.

Alittle downthrust could be accomplished with two washers.

I suspect the incedence of the wing has alot to do with the need for downthrust on a warbird?
More pos incedence, more downthrust ????

Don't know