Sounds like aaronz/28 also set the engine up correct 12.5:1 compression ,surely reconditioned the rods , JE pistons ? Heads massaged ? more hp=more fuel requirements ( lbs/hr) Is it demanding what the cross rams able to supply maybe/maybe not----looks great, plugs are clean. Quite the sleeper and should pull some new factory muscle hard over 100 ( per Car Life 1968 , they were good for 136-138 in stock trim if that's saying anything) Pretty good for an old battle horse! Maybe pick up another set of wheels/tires to put the power down to the pavement. Great package !