I really don't think it will be worth the swap
Your 3.7 has more torque as well as more horsepower. Your car is way heavier then the Mustangs that the 302 was installed in.
Of course you can do what you want but I sure would not ruin a good 3.7 (227ci) unless my engine was already puked or something.
But if you decide to do it you can probably sell your 3.7 engine to defray your costs. I would also think of getting a four speed and rear to match the 302 your installing. There are plenty of them in the scrap yards.
Send for a NPD catalog because they have all of the parts you may need for such a swap.
Try this: http://www.npdlink.com/store/catalog...gs-2763-1.html
2012-candy red- V-6 MCA, Automatic Trans. CFM Valve cover breather. MMD blackTail light trim.Magnaflow axle back street mufflers, JLT oil catch can.MMD hood struts.
Airaid Cold Air intake. red caliper covers, 3.7L performance engine cover, Flat black hood spears.Boss 302 strut brace, CDC rear panel, Trunk Cargo net,--Dash carpet cover,
Viser stickers to cover ugly yellow warning crap,Aluminum driveshafft and Swarr Bar.