Ok I am from a full sized car background and may not be using the same terms that you guys are used to but here it the question.
 When setting up the initial chassis is it set up nose down when looking at the horizontal centerline of the chassis? On Dirt late models and modifieds we typically built a set amount of nose down angle into the chassis.

 I have 4 engines right now and am looking at a best bang for the buck engine to get started. (I am building 3 mowers, local racing has very little rules, must be belt drive is the only rule, but going to use them in the yard for fun also as I have enough acreage I can build a 1/2 mile banked track if I wanted). I have a 14hp OHV engine not pressure lubed, A 13.5 OHV pressure lube engine, a 18hp oppy and a 14hp flat head that has in internal noise.
 Which would you build first and what mods for power and reliability?
Thanks in advance!