the EV27 should be good fopr what you want, the pipes will help too not sure about the ones your talking about. but with pipes you just have to try them. try to get 180+ pound cranking pressure, a good ignition with adjustable advance curve can help low down responce too.

 

Used to own an 89 Softail, Custom Chrome pipes, S&S super E, EV27 cam, Accel coil, Screamin Eagle Ignition. Ended up putting  Barnet oversize clutch in it as it could make the stock clutch slip.

At the time most guys were putting in EV3 cams as they produced more torque higher up the rev range, the EV27 was ideal for solid mounted engines.

just built a 93 dyna wide glide
10.5 to 1 fordged pistons ev47 adjustable rods with travel limiters dyna ignition as krash says but i ported n polished heads an put a 42mm mikuni on it mate ran it in an just had a drink with him at pub today he had a run with a 113 an left the bloke in 2nd lol
doin another build on a 89 fxr an another on a 95 softy in few weeks
if ya do cams an carb n pipes u wont get full potenial unless heads are done a good set 2 into ones if your round towner but go the 2 into 2 if ya mainly on the hwy
cheers ron