Ebay twin turbo setup Checklist...Turbo a SBM for under $1000? :)

60,000 is just nicely broke in, just put a new double roller chain on it. Sneak up on the boost while you sneak down on the tune.
But above all take those turbos apart and rebuild 'em before you bolt 'em on. China doesn't charge extra for the debris they ship along inside of them. That's hearsay btw.
There's only a couple of things worse than two piled up turbos spewing their guts into your intake, after you spent every last dollar you saved up for the last three years.
And there are only a few things better than 450 hp, and I think 450ftlbs at stall could be one of them. Then the next one would be when you finally figure out how to make it hook.
450# at 3000 thru a 2.45 low and 3.55s would be about 3900 ftlbs to the axles. Hyup, I know exactly what that feels like; Hang on everybody!, and pray it goes straight! lol. Actually it's not that exiting but you get the idea. 6000# to the axles, now yer talking! Crazy-talking.

But I was in your shoes about 20 years ago. And I knew I could never afford to do it twice, so I went with tried and true Normally Aspirated,hi-compression 360. I took the engine out and apart 5 or 6 winters in a row, looking for chit. And three of those winters, sure enough chit was happening. But every time I caught it in time and it was a cheap repair. I bought reuseable gaskets on day one, so it only cost me time.At that time the body was fresh outta the bodyshop, and if the engine hadda gone down, the back-up winter-teener wouldda had to be the full-time engine.
But I gotta tell you one thing I learned. For a streeter; gears are everything. That stock long-block 318 could be nearly as much fun as that hi-powered 360; all it took was gears.
It's a lil different tho with a DD or multi-purpose car. If the engine has to pull past 65mph, then a lack of power quickly shows up. And buzzing along the freeway in the 3000s is also not fun.
But for a city-car a stock long block teener, with a 4bbl,headers, a 2800TC, and the right gears can be an awful lotta fun. Make mine a TQ. And make sure it spins at least 5000 without pumping up the lifters. 3.55s and 4000 will get you about 35 in low, and 60 in second.
But the most fun I had was with 4.30s. 5000 was 36 in Low,61 in 2nd, and 90 wound up tight in D. Hyup that was fun. If it wasn't any faster, I didn't care; cuz it sure sounded faster.