68 Plymouth Road Runner Wheels and Tires

Hi I am new to the site and am hoping you all can help me,

I recently purchased a 1968 Roadrunner. I want to raise the rear a bit higher than stock so I purchased a set of OEM Hemi leaf springs for it. They are not installed yet because now I am hearing from some folks thatb this will not raise the rear at all...Is ths true?? and if so what do I do now, is there still a way to raise it 1-2 inches without adding shackles. Someone said to use blocks but I really don't understansd what they mean by this
Any help will be appreciated..

Problem #2
I am going to buy a set of wheels and tires for it and am thinking about getting some Magnum 500 wheels. What is the widest wheel that I can use on both the front and the rear of the car without risking some scrubbing.
I am thinking about 15 x 10" for the rear and 15x8" for the front, but I am but perplexed about the offset thing etc.
Can someone set me straihgt on this, I need to know exactly what I should buy in terms of size, as large as I can go without risking scrubbing tires. Wheel and tire size please, with the offset measurements if possible.
Much appreciated

When I bought my 68 Roadrunner 11 years ago the back end looked like it was sagging; I bought a set of HD leaf springs from one of the aftermarket suspension companies(springs n things or just suspension- don't remember which company) but anyway it raised the car up 1 1/2-2 inches. I ran american racing wheels 15 X 7 on the front and 15 X 8 on the rear with 275/60/15s with no problem; I would think that you wouldn't want a bigger tire than this on the back. I sold the car this summer but click on my website and you can see it's stance with the springs and wheel/tire setup

Might've been PST that I got the springs from but now they only list stock height springs but you can get them to build you a set. I have a 67 R/T and I replaced the 82,000 mile springs with a set of HD hemi/440 Mopar springs (same as what my car came with) thinking that it would raise the car a bit. No change from the worn out springs; identical ride height.

On the 10 inch for the rear it's 4.5" back spacing .

Now I think on 8 inch fronts it's 4.25" back spacing!

well since the rear end sits on top the springs blocks would lower it more!!
Your local truck spring place can add arc to your springs at your request 1" 2" and so on?
It's called re arcing!

You can have your new springs re- arched by a compentent spring shop.
The Mopar Repop springs will only return it to factory or a little lower than factory height..

Or you could resell your new springs and buy another set that has the higher arch already done.

Front wheels 15 x 6, or they will rub when you make a sharp turn..and watch tire diameter or it will clip the fender lower front edge..
Rear wheels 15x8,
Both with standard offset. No deep dish or it will rub...
You could always do it the 70s way and add air shocks !

All 4 wheels in photo (my car) are 15x8, 4.5 backspacing.
Ft tires 265/50R15, rears 295/50R15, stock Hemi rear springs, nose is lowered a little but not much. Never even close to rubbing anything front or rear.
A couple of guys here run 15x10 rears with 5.0 to 5.5 backspacing on their '68-'69 Roadrunners; check the Archive section.

Nice.

my 68 has original hemi springs, 383/ 4- speed

I think the MP "Super Stock" springs raise the rear way up... at least they did on mine.