get rid of that engine for starters.. the 79 is a beautiful car.. but lets face it, it was the most produced camaro to date and isn't going to be worth much as a collector ever.. so i would go ahead and start from the ground up.. suspension..
driveline.. and a coat of paint that makes it different from the other late 70s early 80s camaros.. but as for a suggestion on the engine.. drop a 427ci LS3...