Possible 451 build options

There's no reason a larger valve on it's own should reduce flow, at low lift or anywhere else. If people eff up the ports, bowls and/or valve job while doing it, then all bets are off.

Basic 452 head, VJ and bowl work 2.14/1.81, cheapy SS 3/8" stem valves, not nice undercut Ferreas, super easy, blend in the serdi work. Less than a day's work in the shop. SF-1020 at 28inch vacuum.

.050 36.3/30.0
.100 69.7/60.3
.150 106.3/88.8
.200 141.6/115.5
.300 197.7/155.3
.400 231.2/184.1
.500 240.9/205.3
.600 245.5/217.0

There's no reason to increase port volume by doing anything other than opening up the bowls and blending the results in. Huge ports=low velocity which makes for crappy driving. If you're doing some low lift, tall gear/big tire pickup truck stuff then you might even go with a 30 degree VJ to pick up low lift flow since high lift flow means nothing in that case. Maybe this is excessive tech, but IMO, this is stuff any decent race engine shop should be able to do.

231@050 isn't a huge cam, on the big side, but not undriveable.

I'm assuming that this truck is a 2nd vehicle or some sort of 'play' vehicle. If you're slapping **** together on your only daily driver vehicle then discussing strokers, cam swaps and porting is probably the wrong thing to be doing. S/F....Ken M