[Lifetime Project 72]

I have a 1970 Cadillac with a 472.This engine has never been apart,never any issues other than regular parts that wear out,such as the water pump.It has almost 200,000 on it and still idles and performs smoothly.If you have to get the 429 rebuilt,you will have a very reliable engine.If it were me,I would definately go for it,even if the parts cost more.
When I rebuilt my truck,I entertained the thought of putting a 455 Olds in my 72 GMC.I realized that the extra weight would require different springs up front.
Don`t know how heavy the 429 is,but you may have to swap the front springs out.
Chris