The only thing I would worry about is how he narrowed the track widths and where he got that info from. As long as he was able to properly narrow it you should be fine. If not then you will need to relocate the pick up points on both the front and rear suspension. If you're not comfortable doing this you'll have to pay someone who can. That might get pricey. I would try and contact someone who can do this if you can't first and show them the car then ask them what they think it'll cost to make it right if it isn't already!
John
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'66 Nova/Chevy II - The NEW '69 Camaro!