I'm not a huge old-school Evinrude fan, although I know people who run them and like them. Biggest issue I have with them is thr ruggedness of the lower unit, but if you don't run the boat in lakes or rivers with marine hazards (rock bottom, vegetation with roots, flooded areas, deadheads, etc) that won't be an issue. Make sure you carry prop pins.
I do have to disagree with those who feel a two-stroke at that power level is the way to go. You should be using the existing 2-stroke because you are interested in not spending money on the boat and simply running it.
Fuel consumption is significantly-enough higher in the 2-stroke vs the 4-strokes that you will spend perhaps 30% more on fuel per mile. It could be higher, depends on the condition of your existing motor.
On top of the higher fuel consumption, you have to include the cost of 2-stroke oil, and the older motors require a higher ratio than modern 2-strokes. Taken together, it's a significant enough difference that your fuel costs could be twice as high per mile vs a 4-stroke.
Power out of the hole is a function of the higher torque of the 2-stroke at lower (off-idle) RPMs vs a 4-stroke, but prop pitch and motor trim is a bigger factor than the power curve regardless.
I don't know how much you will be pulling skiers with a 35/15 foot but personally I think if that's your requirement you need more power anyway. Aside from the power out of the hole, there is no advantage to the 2-stroke power-wise.
It's OK as far as I'm concerned to run the existing motor and keep sitting on your wallet ... fuel costs are going to be an issue but nobody ever saved money by buying a new motor (or new vehicle) versus the fuel cost savings. Ever.
Having said that, if you are going to spend money on the boat, regardless of the fuel issue, a new motor in a fuel-injected 4-stroke configuration is without question the way to go. I like Mercury and Yamaha at the power level outboards you probably would be looking at for that hull.
My experience with boats could be summed up as pilot over roughly 70,000 miles / 20,000 hours in outboard powered 16~18' aluminum hulls; 9.9, 15, 20, 25, 40 HP 2-strokes, 40, 50, 60, 75, 80 and 90 HP tiller-equipped 4-strokes.