Thanks for that Jimmee; in that case I think I'll pull the trigger on the MRP thermostatic adapter @ below but will hold off getting their 15 row cooler for now.
I'm not a big fan of running braided hose every-where & even though its a PITA will investigate feasibility of buying a manual Tube bender + Flare kit & replicate the OE hard-lines in AN-8 mild or stainless-steel. I'll also look for a cooler closer to the dims of the OE unit so I can use OE brace / mtg points.
PS: On a related matter; my 4AGE is a big-port with no oil drain from the head to block. Is there any way I can tap an oil drain in the back of the head w/o getting metal shavings / swarf in the oil-ways? I've heard smearing the cutting bit with grease helps but am worried that even a minute amount of swarf may damage the bearings / engine.