Shifter if you have just enough money
Subframes if you have a lil excess, b/c I would recommend getting quality full length subframes from Maximum Motorsports or Global West.
I think I'm going to go with subs, I think you should build the car before you build the engine. What about the Zinc plated full length Steeda subframes for $150? I can't link to them directly on the Steeda website. What's the difference between the full length and the Zinc plated full length?