What vintage is this truck 409 and what kind of truck did it come out of. As a teen in the mid seventies i remember a cousin of mine having a 1960's Chev dump truck and him showing me the motor. Even then i was impressed seeing those W shaped heads. Good luck with the build and keep us informed on it. 

348s came out in 58 for both cars and trucks. Trucks had lower compression, about 7.5, via the truck heads and via 2 areas scooped out of the block at the top of the cylinder bore. In 61, 409s came out in very limited numbers in cars, then they came out in trucks and cars in 62. 409 car blocks are worth a lot of money, so truck blocks are attractive from a cost point of view and can still be upgraded to lots of hp. Later truck 348s had heads that can be used for power with a bit of work and they and the truck 409s had only one scoop (called an eyebrow) in the cylinder wall. If its really a 409, for $200 Id buy it regardless of condition. If all else fails, its a cheap piece of art for the man cave. Ive seen them painted up and used as a mailbox.

i know I will get argument , but financially both 348s and 409s are expensive to work on, you better have deep pockets. yes lots of people are making power from both truck and car blocks, but again cost. They look neat but a decent small block or and big block can clean their clock. I have four of these things two car and two trucks and I can personally tell you I would not spend big money on a truck engine and the car engines are more for show than go , its over ten years of putting things together.

, last truck I picked up was actually three motors in parts it was a thousand bucks mint crank was worth it, the conversion of a car block to a long rod ross piston job , priceless

if you know nothing about 09s or 348s do your research, there are several good publications of how to build these things the right way, and having deep pockets was no joke

You can get a 348 with a passenger side dipstick so this is not a deciding factor. 65wagon is correct on cost to make hp on any W.
check out the numbers on 348-409. I think 333s were truck only and are small port. Small port heads only came out in 63 for a 409. Get pics of the casting numbers and date codes. 409s had an X cast on the front of the driver side block but so did some newer 348s I believe. If its a seized 348, Id buy it for $200 but not for $400.

The value here still gets back to how complete it is and exactly what condition it is, and is it junk or not.

Intake likely  3770083, not 3770088- its a car 61 348 block and intake and truck heads.