The LT-1 should have the large exhaust, same as the big block.
If your car was built in March 1970, it would be considered a "Late" production. The strike in '69 caused a lot of problems with the '70 production run, so it can be confusing.
The '70 production run was shorter than normal, because DeLorean streched out the '69 model run to make up for the loss of production due to the strike.

As has been said before, the only stoopid question, is the one you don't ask!

couldn't have said it better myself.
Never wait for someone else to ask.
Do a quick search on the subject, and if you don't find a good answer, ask away.
And I love those LT1 engines.

so when the power steering hoses ask for small block or big block i purchase small block, correct????????

Outside of the difference in the exhaust diameter, just about anything else (except for the big block hood) will be for a small block. There's likely some specific LT-1 parts, but they'll be meant for a small block, not a big block.

[QUOTE=1BadLT1] so when the power steering hoses ask for small block or big block i purchase small block, correct????????[/QUOTE]

Yup. Most parts you will need will be small block. The only components that were the "same" as a big block was the exhaust on the high HP engines, and some of the brake components on the "special" cars(ZR-1).
Any engine related parts will be for a small block. There are some parts that will interchange, big/small block, tho. Like the distributor, for instance. It will fit either engine, but it will werk best in whatever one it is calibrated for. Some water pumps will interchange, also. The oil filters are the same. For your application, small block for everything.