Build the engine for what you will do the most....

They make smaller solid flat tappet cams...

Maybe these articles will help shed some light:

http://www.mustangandfords.com/techarticles/engine/mdmp_1202_engine_building_part_1_power_principles/index.html

http://www.mustangandfords.com/techarticles/engine/mdmp_1203_engine_building_part_2_power_principles/index.html

http://www.mustangandfords.com/techarticles/engine/mdmp_1204_engine_building_part_3_power_principles_heads_cam_intake/index.html

Brent Lykins
B2 Motorsports, LLC