These days it's expensive to buy even the cheapest performance cars. But back in the '70s? Four wheels, some displacement, and some horsepower came easy. $3,500 in 1970 is equivalent to just over $28,000 now. Pretty cheap for cutting edge muscle cars. And if you kept one in pristine condition, you're sitting on a small fortune now. Here are 10 muscle cars from the 1970s and what they're worth today. Late ‘70s Pontiac Firebird Trans Am SE: Under $9,000A Trans Am in the late ‘70s went for under $9,000. Today, the classic is worth $50,000 or more.1979 Chevy Camaro Z28: $4,676Today, versions can fetch $100,000 or more at auctions.‘70s Corvettes: $5,000Original prices ranged from just under to a bit over five grand. Now, you have to cough up anywhere from $20,000 to $100,000 depending on condition.1970 Chevrolet Chevelle SS 454: Under $5,000No matter the performance package, this Chevy stayed under $5,000. Now, it’s worth almost $90,000.1970 Mustang Mach 1: $3,271In 1970, a Mach One started at just over 3k, and cheaper models went for even less. Now, they’re over $50,000.Plymouth Road Runner Superbird: $4,300Despite its iconic shape, the Road Runner started under $5k. Now, good luck getting one for under 100k. Different trims can cost even more.1970 Oldsmobile 442: $3,376The W-30 performance package only added around $500 bucks in 1970. Now, it drives the price from $50,000, to over $100,000.1970 Pontiac GTO 455: $3,267Lower trims kept the GTO 455 in the $3,500 range. Now, those trims take it from $50,000 to $150,000.