1) Immigration: Open borders are good. Cheap labor increases business profits.
2) Trade: Unlimited free trade is good. American businesses can buy from foreign companies, or set up their own manufacturing operations overseas and increase business profits.
3) Foreign policy: America need to be involved in conflicts all over the world. Businesses can make a lot of money with all that the government spends on blowing stuff up.
And, of course, probably half or more of people who consider themselves to be conservative disagree with those positions on immigration, trade and foreign policy. But that is what the GOP has backed over the years.
Actually, what many who call themselves conservatives and agree with those positions actually are, they're globalists when it comes to immigration, trade and foreign policy, but not many like that accurate label.
But it's pretty silly for the argument to go on and on about what candidate is and isn't conservative when the critical issues just don't fit neatly into those categories.
My impression from reading FreeRepublic over the years, is that at least half the people who would define themselves as strong conservatives just pine for a return to the 1950's. Probably mostly related to demographics and social issues, but also back to a time before the rest of the world caught up to the US in education and technology.
Of course, imagining a return to the past would also put us at a point where illegal immigration, trade, and foreign policy weren't issues you used in choosing which candidate to vote for.