I'd take it to the local MAACO..........I never understood the compulsion to have perfect underhood paint.........isn't worth the price or the hassle...makes working on the car much more stressful when blankets are covering everything!
Or just do it yourself....not rocket science at all....use single stage.
1969 Buick Sportwagon 455 Stage 1 Ram Air SOLD Nationwise Auto Parts Alumni 1982-1984