Street performance tips, 225 slant 6

Welcome to the site, i hope you enjoy it here!
Maybe check out the slant 6 forum here, there's a lot of good topics and discussions there.....or check out slantsix.org.
Personally, i would look at getting a super 6 2 bbl intake and carb and maybe some dutra duals for the exhaust (a modified split stock exhaust manifold) and a good free flowing exhaust system. That should help a lot by giving you a more powerful engine that has good gas milage and is very drivable.
I can't help you on the stalling issue.
I hope this helps.
Good luck and keep us posted. BTW, gas is 96 cents per liter here.
Tom.