Looking to purchase an intercooler to work with an M1 application. From what I've been reading the RTech is the way to go but the $ is more than I can swing. Any suggestion where I can find one new or used under $1000.00 ?

How much?

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I have a used intercooler,it's for the M4 it is the 504.

watch ebay,they pop up about every 2 months,try to find a aw504,it has more cooling than the 324,Smitty.
Ive seen them go for around 600-700$

By using the larger intercooler will I lose any boost pressure ? I guess it doesn't matter much since the charge air will be cooler right ?

Bigger cooler, less restriction, cooler air charge,less HP to turn procharger,run higher boost, more timing, less chance of detination, more HP to the prop, faster boat. The 504 cooler has a 4inch inlet and outlet, not knowing what size outlet is on the blower, you may need a reducer, which is available.

The M1 has a 3" outlet as does the carb enclosure. I assume the reducers will not affect air flow correct ?

It would be fine from the blower to the cooler, it may pick up the air speed going into the carb enclosure, I would probably run a carb hat, for peak performance.