I am in the middle of building a 393, my budget is also in the $3500 range, but I don't think I'll make it. I used the Scat crank and rods, KB #364 pistons, I am planning on using the Roush 200, 64 cc heads with minor port work for better flow, and a mild cam for street driving. My car will not be a race car, but I am still looking for appx 450 hp and a little more for torque. Hopefully I will be picking up my engine from the machine shop today or tommorrow. Feel free to PM me if you want details on the components I am using.
For others building this motor, I would like your input on cam choices, what are you using and what kind of idle/performance do you expect.