I'm looking at a set of headers for the Imp. The factory exhaust manifolds are not compatible with Edelbrock heads so a change is required.

Keep in mind that I'm building an ultra heavy, quiet, and comfortable car for cross country road trips. The engine combo on paper (okay, my old dyno software) should be pushing 450+ torque from 2000 to 5200 rpm and tickle 500 lb/ft from 3500 to 4500. Power should be 400+ from 4500 to 6000, peaking around 440 between 5000 and 5500. I'm really doubting the intake will pull those higher rpm numbers but the fat mid-range looks tasty.
Saddle that engine to a drivetrain and power at the ground will be significantly lower.

The headers I'm looking at are:
1) Hedman shorties
2) TTi shorties
3) Schumacher Tri-Y
4) TTi full length 1-3/4

The requirements:
1) Must fit angle plug Eddy heads in a C body.
2) Quality stuff that won't leak.
3) No ground clearance issues.
4) Ease of servicing plugs and starter.

The car:
5300 lb luxo-barge highway cruiser
Power steering
Power brakes
Column shifter
3.23 gears
29" tire
Stock converter
727 (46RH swap planned)

The combo:
440 std bore
10.2:1 compression
Edelbrock Performer 88cc heads
Comp 261/.463 cam
106 center line
110 separation
CH4B intake (low hood clearance)
Eddy carb (to be replaced by FiTech)


Which set of headers would best fit the bill? I was thinking about the Hedman shorties for an easy way out but the TTi shorties and Tri-Ys are looking pretty good. Sadly, I do not have any experience with any of these headers.