I have a 91 Z with a non-modified 305.

I am in the process of having a 4.10 Eaton POSI Disc rear installed. So to get the best out of this I need to modify my engine (had a 5.7 but my buddy just killed his engine in a '79 Z) He picked the parts up for me so.....

Anyway what can I do to modify my exisiting engine to get the most out of my new rear. (Oh for those of you saying why did a get a rear like that, it was almost new and cost me $150).

nice big hairy cam, new springs and rr's

a t-56 swap would work well with those gears You can even keep some gas mileage.

i agree either a manual or build youre 700 with some nice stall.. i still vote cam it!! and dont forget suspenion goodies.. u do want that bad boy to hook up a little bit.. maybe??

Any recommendation on parts. (FYI- It is an automatic now)

im going to install crane cam 2032.. its perfect for an lb9.. it should be done by may so the wait is on.. im also going procharger..as far as suspension goes i like my umi peices there identical to hotchkins at 1/2 the price. also throw some headderon that z.

and for a tranny rebuid there's a shop called freddy brown. there in my hometown. theyve been building hi po tranny's for 40yr's there the best boiled and coated cases and everything soup to nuts. s-k speed stocks them as well. they also have a website.

steep gears for a TPI!!!!

BIG cam/ good flowing heads/ and (i have never said this before bc i dont believe it) RIP OFF THE TPI!!

the 4.10s are goiing to get your outa the hole and ur powerband in quite a hurry, switching to a better form of intake will prob net more power since your gona be reving this thing to the moon. i dont think ur shift points are gona be 5000-5200 with that TPI lol.

What kind of dough will that Tranny rebuild cost?

Worst come to worst I will trade someone my gears for a 3.73!!!

it depends, on a few things mostly upwards of $1700, but youll have a tranny that will deal with any future combo. u will ever want to run.