Isn't this like a youngster arguing with Carrol Shelby, telling him he should swap-out that little 260/289 V8 in his Cobra for a 4 cyl out of a Thunderbird Turbo Coupe?

Tech, if yanking out your 3.2 and putting in a 400 H.P. Merc. 4 cyl. is what it takes to get you excited, then good luck.
But Rudy is one of the top 3 guys I'd listen to when it comes to engine swaps on this forum. If he says it's a waste of time, then you can take that to the bank.