I have the Offy intake. I run Clifford Research long tube headers. I got these parts in 1978 when they were $65.26 and $93.50. The Clifford headers have lasted pretty well, but I live in the desert. After a 25 year run on my first built 292 L6, I had them bead blasted and hot tanked and sprayed w/ VHT Cast Iron Grey. I bought them off the shelf from Townsend's Racing Works in Tucson. The Holley 390 didn't make it past the first 250 000 miles. When I rebuilt the original 292 in 2005, I replaced it with an Edelbrock 1404 500 CFM aluminum four barrel.
If you join Inliners International [
www.inliners.org ] you can get a members discount from Ross Pistons on their forged pistons. I bought forged .030-over TRW pistons back in '77, but you can't get 'em anymore.