Hi guys, new member and my first engine build. i have a 350 5.7 Chevy Vortec engine. its been bored out .60 and has a 383 stroker kit. it has a camshaft with Duration 288/298, Lift .444/.466 . here are some specs on the kit. i also have a quickfuel 750 cfm double pumper carb.

Bore (in): 4.060 in.
Bore (mm): 103.124mm
Engine Stroke (in): 3.750 in.
Balanced: Yes
Pistons Included: Yes
Piston Rings Included: Yes
Piston and Ring Oversize (in): 0.060 in.
Piston Material: Hypereutectic aluminum
Piston Style: Dish, with a D-shaped cup
Piston Head Volume (cc): +12.00cc
Wrist Pin Style: Floating
Piston Ring Facing Material: Plasmamoly

i plan on running nos but no turbo. should use a copper head gasket or MLS?

should i go with a thinner or thicker gasket


the engine still has the stock valves and they are in decent condition, will putting in some new ones give me more hp or can i get away with the stock ones?

i know its a lot so any feedback would greatly be appreciated. thanks guys!