318 driver - cam change or not?

ok
sealed power cam is same as 204-214 already mentioned
compare all against Slantsix64's post above
Howards Cams 711381-10 - Howards Cams Hydraulic Flat Tappet Camshafts 110lca
Advertised Duration .006 255/261, .050 208 int./214 exh.Lift .479/.494,
(chevy 255/261 version for comparison Duration 255/261, Lift .410/.420,
sort like the 204-214)

the lunati slantsix64 mentioned is 250/256 .006, 208 int./213 exh. Lift .454/.454,
it has a 112lca but with the shorter seat to seat it closes the intake at about the same place as the Howards. Lunati has lots less overlap with the shorter durations and wider LCA combined
note that the Howard has an "intensity" (.006>.050) of 47 and the Lunati gets to .050 in 42 degrees (both open and closed sides so not perfect but you get the idea)(comp 268 takes 50, 260 48, 252 46)
Me I'd have Mike Jones grind me one with his motorhome lobe on the intake and let him pick the exhaust lobe and lca he get's even shorter actual seat to seat timings and about the lift of the Lunati but more duration at .275 than the others

either will outperform a 340hp cam or comp 268 in this application