Be carefull there. I used certain "F" body springs for a reason. The top to bottom space in the spring tower is shorter on an "A" or "G" body than an "F" body which automatically gave some lift to the front end. The springs I used were from a 79' Firebird Formula with 301 engine as I was installing a 301 into the wagon. Therefore I got the lift I wanted but the rate was not excessive and my front end is compliant to the road. Years ago I tried 77' TA 400 springs in an 81' Malibu wagon and although they fit, the front end pointed to the sky. I had to cut off 3/4 of a coil to drop it down and that increased the rate a lot, which was not a bad thing having a Pontiac 400 under the hood. Big block springs will be very thick, as the 400 springs were, and may be too stiff for a 350. 78' ElCamino's could be had with 350's and those springs would be my choice if stock height was desired. For a bit of lift, 70's Camaro 350 springs may be what you want.