Is my 1" Phenolic spacer hurting me? and TB ?

[Rick 91GT]

How much does increasing the runner length by 1" hurt top end power? I added the 1" spacer as a attemp to gain some low end torque back with my combo since I have the 2.02" valves and the Holley is more of a top end kit. What do you guys think, anybody have any numbers? The spacer does keep the upper manifold a honest 75 degrees cooler. I am swapping cams this winter and was thinking of dropping the spacer if it will give me a little more top end HP, I am switching to 4:30's, 28" slicks and I currently shift at 6200rpms.
Would switching to a larger TB help me since I am looking at more Top End charge, I no I have seen many debates over the years on this topic only but and I would hate to jump on the band wagon but....I see a lot of guys that are NA running 75mm or larger. I am looking at going soild 11's all motor with some tuning and mild porting this winter.

Any info would be great

Rick

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My Ride Check Out My Site 91GT, Holley SysteMAX II Kit-Heads 2.02" x 1.60",Full MAC exhaust 1-5/8" Long tubes, 2-1/2" O.R H-Pipe, 2 1/2" cat back, 12" K&N Filter, RNH PERFORMANCE Ram Air, Ron Davis Radiator, Full Suspension,3:73's, Welds, Best on new motor-12.60 @ 108, no traction 1.98