Suspension, sway bars, wheel&tire upgrades, help!!!

What I read is you have no anti sway bar, and old mushy 318 torsion bars in a 450 hp car… Death wish came to mind. LOL

That sensation of passenger’s front fender dipping under hard acceleration is just part of the image, the driver’s side is also lifting. The torque is twisting the front of the car, these cars were designed for less than 300 hp, & 300 ft lb torque from a big old BB.

When chassis twists, and suspension is under sized one ends up with a flopping mess. Envision this: the car is lined up sitting in one position on the frontend rack to factory settings; when accelerating hard, chassis twists temporarily changing every front end setting making for funky handling; upon letting off power the settings once again change requiring more human impute to control the car’s trajectory… Sort of like bump steer on steroids; the suspension can’t do its job if the chassis is constantly deforming, and a soft suspension can’t cope with the extreme torque demands becoming over taxed.

You need to install additional stiffening under the lower radiator support to tie the front frame rails together, (picture a long low “U” under support connecting both rails). At the moment I can’t locate a vender that I’ve seen that sells this reinforcement, or just bend up something and weld it on. Also installing torque boxes on all four corners will help stiffen chassis, and further tie it together.

Next is suspension, you need +1 inch torsion bars, 1 1/8 or larger anti sway bar, reinforced lower control arms (it’s a stiffing plate welded to bottom side of arm). These changes will make the car corner flat, and with chassis stiffened will greatly improve handling close to modern car levels.

Out back I would hold off installing a rear sway bar until all front end upgrades are made, and you have driven the car for a while to assess its new handling characteristics. A Bodies tend to be tail happy, and rear sway bar can exacerbate oversteer depending on rear spring and tire choice. SS springs are a drag race item where spring has a higher arch that cocks the car to handle the torque load under WOT; a good thing for drag racing, but perhaps not ideal for road handling. A lot of folks use them on the street, but I don’t believe they offer the best street manners and are a trade-off for track performance.

You have to decide if you want a drag queen, or a good handling road machine that will perhaps give up a wee bit at the track but still go like stink.

You may find that six lief stock ride height rear springs such as stock Formula S Cuda used may provide better road handling. Stock ride height will settle down a tail happy car. As the rear end of these cars is lifted, oversteer becomes more of an issue.