Yup far too good to skip it, Jacksons whatever their age or condition are worth something, so please don’t skip it.
Sounds like a “Flying V” shape to me from what you describe, typical Heavy Metal guitar…
Hard to price up something like this without seeing it obvs, but if all the bits are original and just need a fettle to get it back in playing order, then I’d say open bids at £250 and see how it goes..
Tried eBay for price comparisons yet??
Edit: ok just took a peek at eBay and it seems some Jacksons are made in Japan (the only ones I remeber were made in the US, but there you go), the early guitars were made in the US and it’s the U.S. made versions that command the highest price. Check the serial number which could be on the neck plate of headstock, possibly in one of the pickup/pots recesses.. That will give you an idea, you may even find a ” made in..” Sticker too.
Still, if it’s a U.S. version it’ll be worth something, if Japanese then a little less..
HTH