I've been reading as much as I can but being very new to restoring cars, finding the info I need isn't as easy as I hoped it would be.
I've tried real hard to search and find the answers I need to address my concerns but I just can't seem to find exact answers to what i need so i'm taking the chance (and the risk of getting quite a few "do the search" comments) in hopes of getting help fast.
Scenario: We're halfway done with the RB20 swap part of the restoration project and the plan is to move on next to bodywork and painting. First thing we need to do now is buy the rims and tires so we'll know how much to cut and how wide we need to extend/widen the flarings. I want to put 245 tires in front and 275 in the back and i'm in the process of looking for rims that'll allow for that. Per my research, I have to get rims 8" wide in front and 9.5" rear.
The stores that sell rims keep asking for the offset. I've researched and now know what offset and backspacing mean. The thing is, the rims currently installed aren't stock anymore and I don't know if they were a proper fit on the car when I bought it (we never got to road test the car) so giving the offset on the current rims isn't exactly definitive as they could've been a wrong fit. I would rather get the rims/tires now so we can start the flaring-extension job and not have to wait for the engine swap to finish and drive the car to the rim store.
My questions are:
1. What offset do I tell the salespeople at the mags store? Is there a stock offset to live by? All i've gotten from my search is that stock is 4x4.5
2. If I decide to opt for the 5 lug variety, what do you think of some guy's suggestion that I simply need to fabricate adapters (that can serve as backspacers too) that we'll bolt on to the stock 4-lug assembly. Is it true that this is as safe as changing the whole assembly to that of an original 5-lug one. I don't know if this question makes sense ... it's hard to ask questions when one doesn't know the proper terminologies.
3. We'll be extending the flaring as much as needed so the outer part shouldn't be a problem. What do I need to look out for in the inner part? Are there concerns about the inner part of the tire hitting anything inside (like the shocks I suppose)? With such wide rims/tires, do I automatically need to change the shocks/springs?
Really looking forward to helpful comments and suggestions. Please feel free to add anything you deem will prove helpful in this project.
Thanks in advance.