Richard, I tip my wrenches to you for a fine looking job indeed. I personally don't think I would do a swap with mine unless, like you, it was a tired diesel. I agree with cdbo that you should take it to a dealer for an oil change just to see the reaction
I am wondering though, what are you planning to put on the boot-lid, 4300 CHVY perhaps. Also, good choice on an engine, folks have been putting Chevy engines in Fords for years. OOPS, that might start a feud but .......
1991 300SE (my ride, 279,000 miles, looks almost new
1954 Cadillac (21 yo son's car, he bought when age 15)
1972 SeaBird 19 ft runabout (old but solid, slant six, Volvo sterndrive perfect condition, undergoing complete overhaul and refit)
1998 Toyota Rav4 (my sons daily driver when he is in the Continental US, PROUDLY serving in US Navy)