Ok guys, u pick the right cam

If you're not doing anything to the stock heads...then you should run the stock cam. The stock cam works great with the stock heads. The stock heads don't flow enough to benefit from a B or E-303 cam. I had a friend do the same type of swap in to a mid 60s Mustang. He used a motor from a '90 5.0...ran the stock heads, block & internals with an Edelbrock high rise manifold, bigger carb with mechanical secondaries & long tube headers with Flowmaster mufflers. The thing sounded mean. Much healthier sounding and rumbled quite a bit louder than any stock '87'-93 I've heard. This thing hauled *** too. It was an auto (not sure which tranny) with a 2000 stall...and would wax a lot of newer Mustangs with way more mods.