Another problem with the Mercs is that they suffer with weak gearboxes whether it's a V6 or a V8.
I had a W210 E280 (2.8 V6) that snapped the main shaft in the box just as I rolled to a stop and I now have a W220 S320 (3.2 V6) that is just about to lunch it's second gearbox. A rebuild is £2k+, the car's not worth that much and matching a 2nd hand unit to my cars engine & gearbox electronics is the nightmare from hell.
I'll stick with my SBC & TH350 in the Magnette thank you very much. Just imagine the TH350 I could have for £2k!