i have another question on speeding up my car now, how much extra horse power would nos give my LC1 car? and is it possible, with out putting 2 much stress on the motor, want it safe as possibe?

GET A BEATER TO DESTROY!
I can't believe you!!!!

Well said.

IMO, do all OTHER mods first, then if its still not enough, get the nos or a bigger engine.

true i gave up on that now, people tell me that it will do damage no matter what unless i rebuild it for nos. but ya i am goin shopping this weekend for a 350 or 305, now what motor will fit in the best and i want to stay carb since it will cost me less. this guy is telling me lg4 is the best for my cars but u guys on this board keep saying they r crap. y? i want it as simple as possible.

Carb's 3rd Gens are up to (I BELIEVE ) 1987 model year.
So get any V-8 3rd gen ride ya like.
Destroyed engine don't matter. Replace the V-8 long block for cheap & go have fun!

DON'T DESTROY YOUR BEAUTIFUL RIDE NOR BUTCHER IT TO ACCEPT A V-8.
Just enjoy the cruise, your ride is to valuable as is.

You can go BUY A BEATER 3rd gen in CA for under what it costs for a pair of shoes right now, as wrecking yards are full of them.
I know of two right now for sale both in a yard. I can go to another yard & find about 3 dozen for parts or sale and that's only one yard..