here is a high volume pump from autozone , and the spring that your referring to is for high pressure witch you dont need as the pump works just fine as is ! i would never use a used spring in a new pump , your currant pick up tube will work with this pump just clean it up good !

Melling/Oil Pump

For your 1990 Ford Truck F150 1/2 ton P/U 4WD 5.8L FI Windsor 8cyl
Price:
$39.99


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Part Number: M-83HV
Alternate Part Number: 50123
AVAILABILITY:
STORE PICK UP
SPECIAL ORDER
Visit your local store to special order.
SHIP TO HOME
AVAILABLE
Ships within 2 business days.
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Features & Benefits
High volume replacement oil pump
Part Number: M-83HV
Weight: 5.7 lbs
Warranty: 1 YR
Notes: High volumeIt has 25% additional volume of oil than stock pump, stock relief valve and shaft design, may require minor modification of oil pan. Priced individually.
Material: Cast Iron
Quantity: 1
Shipping Information: Overnight and Two Day shipping are not available for PO Box, APO/FPO/DPO or US Territory addresses.