Hi guys, 1981 wellcraft nova 11 twin 350's through prop exhaust. I got a real good deal on exhaust center rise mamafolds and I plan on changing the exhaust from the log type used on older mercrusers to center risers. I was wondering if I would run into any problems using the old thermostat housing? I think that only a re-rout of the water hoses would be the problem. If any one could give me some advice would be great. Thanks Buz