Put a cam only 5.7 hemi in it. And sub 100k long block, with a car 5.7 intake, springs and a cam will put down about 330rwhp. You'll make more power than most combos with something simple. A little less than 400 crank with room to grow.

If you find a complete shortblock, you can have it running and in the car for $5-8k depending on how thrifty you are.