I hit fletch's carbed mustangs and looked at his flow numbers for iron and aluminum heads... those thumper heads and their 218/154 flows outdo a lot of the milder aftermarket and gt40 heads and do darn well for the $600 they cost. Plus everything will bolt right back up since they are, after all, stock heads.
Anyhow, after doing my own "porting" for a week or two, I say it is very much not beyond the abilities of the average joe. I've been using a drill and a rotary file on an extension and using the way too soft blue grindstones (at least it's hard to make a sudden mistake when you have to grind for 2-3 minutes to get an area smooth). Go for it. It will cost you a bunch of time but only $50 max in drill bits and maybe a burnt out drill. Have 2 drills and let one cool while you work with the other. Every once in a while, stop and switch to 80 gritting the runners and let both cool.
Most of all, it will be FUN and you'll feel like you're really taking the project in hand.
Good luck!
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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