big blocks and Bravos and merc stock center riser cast iron manifold.................the gills should fit.............the beam of the boat has nothing to do with it,it's the center line of the motors that tells the tail

That is what I was thinking. I just wish the boat wasn't shrink wrapped. I hate to buy something if it won't work and I am pretty sure the stock manifolds and risers have seen their day.

I found a couple sets of gils in a few places all for a really good price.

Get a chance to measure???

Can you measure the drive center line from outside? Measure to the top center of the transom assembly. This will be the same as the engine center line. I can go measure mine right now if you think it would help...

Here is my center line on the 303....

they fit fine. i got a 90 272 have emi's on it with the long tails. identical to the gils. just on the outside tails the exhaust hole in the transom is in, so u have to angle the exhaust hose in. but everything fits fine

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Gils fit fine on my 1992 336 with 8'0" beam.