you dont need to get them welded at legal height.
get them engineered with your car and then they are legal and dont need to be welded, adjust the height accordingly .
if you get done for too low , raise the coilovers to legal height , go to regency , present engineers report and your fine.
my mate has his r33 engineered with coilovers.
only time they need to be welded is if you go through regency and get caught with coilovers in