it bolts in place and if your flange is off
the factory catback was EXTREMELY restrictive and a high flow catback system is almost required or open downpipe
Fits Years: 64-67 and 68-72
SFI Safety Rated: non-SFI
2 Nuts Package Quantity: 1 Packaging Type: Box Port Shape: Square
1967-1969 F-Body TH350 & 1968-1974 X-Body Crossmember GMC-Sierra-1500-2007 it bolts in place andFits Models: GM F and X Body Models: Camaro, Nova, Formula 400, Trans Am, Firebird, Ventura, Omega, Apollo, Chevy II. Fits Years: 67 69 F Body, 68 74 X Body This crossmember fits both SBC and BBC engines for the 67 69 F Body and 68 74 X Body. Fits Transmissions: TH350, TH200, TH250, Muncie, T10, Super T10, Powerglide, Saginaw We recommend a polyurethane transmission mount. The GMTM is sold separately. For the 1967 1969 F Body and 1968 1974 X Body