I've done that mod. not in a 1650 but a 122 chassis. its pretty involved. the ears on the block need to be machined off and the holes welded or epoxied in . the pto probably won't work. the 361's had 1 1/8 pto end but you can use a crank out of a 16 with a 1 inch end. the motor sits a bit higher due to the rockers and valve cover. you probably won't be able to use the exhaust shrouding. most parts are NLA now. I know for a fact the rods are, only real choice is a 16 rod. but if the rod in the 18 is good just insert it. cam you won't find one better than the 361 cam. the Kirk cam is a copy of that , the lacota cam would be a step up. biggest problems with the 361 was the valve seats falling out.
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