Cobra intake and 65mm on Speed density?

[LOCASH]

I have the 86 motor. The intake and throttle body are even smaller that 87+ and the heads suck. Would this be a good subsequent mod? Is it going to cause any drivability problems? And lastly (and most importantly!)would I notice an increase in horsepower? Thanks in advance.

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86 GT T-tops, AOD, B&M shift kit and hammer shifter, ROH wheels, K&N, Timing,MAC headers, 2.5 off road H, 2.5 American Thunder, 87 spindles, rear disc,SS lines, BBK 1.5, poly bushings, Steeda G-trac and subs, Strut bar.
"DRIVE LIKE YOU STOLE IT!"