changing chopped springs..

I have a 64 chevy II, and the springs are shortened in the front to give it a slanted look. I like the way it looks, but I have been running into allignment problems and I'm wearing out tires. Just got back from les shuab and had an allignment done for the second time, and it drives straighter, but feels kind wierd. the guy said it would probably help to put the longer springs back in. My question is, can I put origional springs back in even though it now has a 350 in it instead of the straight six, or do I have to buy some kind of beefed up springs? And how hard is it to put these origionals back in? thanks, Kevin