Hers' my take on the market...
some opinions will vary from place to place too
what happens here out west
may not be good for what happens
in the east or midwest
IMO;
Today a well-done quality build, with quailty parts
well-sorted 'Resto-mod'
They will bring as much if not sometimes more
then the fully restored car, in an auction setting
the 'open market' is sometimes harder to predict too
there's lots of lipstick on pigs out there too,
"so called" Resto-mods or restorations, that are NOT really what they claim
barn find, survivor, 'original' or even '#'s matching'
when they really aren't, it's sort-of a bait & switch type deal
to draw you in
a bunch of E-scam/marketing terms to get better prices,
maybe to draw an audience
they probably wouldn't draw without
10 years ago I'd have said stock restoration parts replacements
#'s matching especially brings like 25% or more $$$
IMO today the trend is more towards the 'Resto-mod'
(& older trucks/pickups, 4x4's, Jeeps etc.)
day 2 builds, mostly stock body panels, mild customizations
like nice paint, glass hood or scoop, nice wheels tires & o/d trans
different gears & sure-grip (limited slip) maybe mini-tubbed,
some aftermarket suspension, like shocks & sway-bars, low stance etc.
Maybe ?, cars they had as a youth,
they couldn't afford & always wanted etc.
& then there's Pro-touring, low stance,
larger wheels & tires usually like 18" to 22",
also all aftermarket suspension, tubular k-members, tubular CA's & coli overs
A/C, power windows, modern drivetrain, all the power
turbos & blowers, many with a full cage, custom dashes & consoles
big stereo systems & all the luxuries too, are all common
some bring big $$$,
it's also expensive to build them
it's not the same type of build as a Resto-Mod
a stock quality OE restoration isn't cheap either
especially if you use NOS parts, not a bunch of today's repops
5-10 years ago they brought a lot of $$$
I prefer day 2 cars all day, more on the line of resto-mods
if it's a rare car, most (especially the purists) will side with
the staying much closer to stock or near-stock as possible
BUT;
they're only original once, real survivours, bring good money too