383 vs 400

i have run both engines in my car...
75 duster 3000 stall, 3.23 gears, used same set of 452 heads 84-86 cc open chamber, and 69 c-body hp manifolds on both engines, torquer intake portmatched and 650 double pumper on both 1 in spacer, dual 2.5 exh. and heres the differences and fastest times in the quarter...
69' 383 hp bone stock flat top pistons and 0 deck, fastest time in the quarter was consistent 14.00-14.20's
75' 400, bone stock bottom end, pistons flat top but 20 in the hole, comp 284 xe cam, matching springs and lifters, double roller timing chain and smaller crank pulley, the 400 would run in the 14.20-14.50 range
both engines were fun, and streetable, i found the 383 to be a happy quick reving engine, while the 400 would rev but it was a noticeable difference between the two. that being said if the 400's pistons were at 0 deck height it would probably be very fun to drive with the extra cubes and making more torque, my preference is the 383. however i like revs if your going for torque i would bump comp up on a 400 and play with it, parts on both engines are interchangeable, minus pistons, and easy enough to find kicking around, theres my two bits take what you want
cheers :)