I think its just a matter of tuning your combo to its full potential  I ran a 60 over flatop 283(300hp /350 heads, 350hp 327 cam, 600 dp holley, headers/turbo muffs with dumps). It ran a M 21 muncie behind it with 3.73 gear in the rear......not much for low end tork, but it ran like stink from about 3500- 6800 rpms! Flat open on the hyway would set the speedo needle on the M in the MPH(a little past straight down).....about 120, my guess? Those little engines love the revs! I would go for the headers & better flowing muffs to start with, then get into any ign recurve, & carb setup. Good luck,crazyL 
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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