Yeah TTI is way out there on price.. But some of the others said, hammering is kinda a n necessary evil. I also ran into a problem with installing my headers on 452 heads. The heads I used had a casting lip at the top of the exhaust ports. Not sure if they all had this casting lip, but mine did. So after: raising the front end 2-3 feet in the air, unhooking the steering link and torsion bars. I bolted the headers up to the heads to discover that header flange was too wide and hit the lip on the heads. So I had to take them back out and grid the flanges down to make them fit. Along with dinging both headers at the sides to clear the torsion bars. But it was worth it to know I saved $500+ on the Hooker Super comps compared to the TTI's.
Now I have flow tech's on my 72 charger and they are resting on the ps gear box, so when I get around to it, they with be dinged up to fit as well.
The things we do for MOPOWER!!!