Thinking about a 454.. 1978 GMC C15 1/2 Ton

[HunterRotten]

A topic I posted in the 73-87 section has had a lot of feedback and I am seriously considering a 454. In fact I told the guy I'd take the 1981 454 with 115,000 miles for $500 and the 094 heads for $300 ontop of that.

If you want to read up on that, here is the link to the thread.

Someone suggested I come here and ask what this would do to my truck. My truck as of right now has mcgaughy's 2" lowering coils and 2.5" drop spindles. I plan on replacing the coils with 1" drop coils from Belltech if I find out what the spring rate is. If not, then stock equivalent coils. To accompany this, I also have CPP tubular control arms on the top and bottom.

On the rear end I now have brand new 1950 lb springs (4+1 leafs) and a set of caltracs. This has been flipped with a mcgaughy's flip kit.

Here's an image of how the truck sits with the 2.5" drop spindles, 2" drop coils, and 1250 lb rated leafs on a flip kit that are sagging.

There's a lot of unknowns here and thats why I've come to this forum to see what other opinions are. I think the 1950 lb springs lifted the rear up but not much more than .25"